Bearing steel production skills

Source: China Bearing Network Time: 2017-11-25

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Bearing steel is a steel with strict quality requirements. The current demand for bearing steel is: user-free machining and inspection, quality improvement, standard refinement and progressive scale accuracy; and; In order to satisfy these needs, JFE Steel uses a variety of equipment to ensure product quality and finish the production of bearing steel. These equipments are combined with newly developed and improved quality skills; capable of producing scales of scale, high quality, added value High heat treatment and hot rolled bearing steel.
The characteristics of JFE bearing steel production skills are:
1) Appearance quality precision machining and quality inspection system: The method of blasting steel billets and rolling continuous casting billets into small round billets; uniformly removing surface flaws, subcutaneous inclusions and decarburization layers. The disadvantages of the height removal of the billet squeegee are to ensure the appearance quality of the small round billet; the active eddy current flaw detector and the magnetic particle flaw detector are used for inspection, and the internal defects are used; the internal porosity and inclusions are detected by the round blank full-section ultrasonic flaw detector.
2) The precision manufacturing skill and quality of bearing steel ensure the wire-bar factory; the wire rolling line is added on the bar rolling line; the joint rolling is carried out. The four-roll finishing mill is used for the finishing of the bar and wire. The scale accuracy of the bar steel is below 0.01 mm; the user can save the mink and the drawing process. The wire can be rolled at a free scale; and the small-scale wire of Î¦4.2 mm can be produced. Because the wire has been rolled to The scale of casting; so the user can save the process of wire drawing, heat treatment and surface treatment.
3) The cleanliness of progressive steel for these years; JFE steel is used to improve the cleanliness of steel; PERM (extraction and decompression) and LF (external furnace) have been used to improve the steel production process. The PERM method is When the converter is in exercise; dissolve nitrogen, hydrogen and other gases in the steel; then; use RH furnace (vacuum degassing) to decompress agile; generate gas in the steel; use this gas to capture and sweep the inclusions in the molten steel.
JFE Steel also built a new LF furnace in 2008; it greatly improved the removal of inclusions. The role of the above process and equipment is: compared with the original process; the number of inclusions is reduced by 34%, and the maximum diameter index of inclusions The standard deviation of the 29% reduction and the maximum diameter index distribution of inclusions was reduced by 73%.

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